CS47L15 datasheet(90/279 Pages) CIRRUS

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DS1137F2

CS47L15

4.5 DSP Peripheral Control

The CS47L15 incorporates a suite of DSP peripheral functions that can be integrated together to provide an enhanced

capability for DSP applications. Configurable event log functions provide multichannel monitoring of internal and external

signals. The general-purpose timers provide time-stamp data for the event logs; they also support the watchdog and other

miscellaneous time-based functions. Maskable GPIO provides an efficient mechanism for the DSP core to access the

required input and output signals.

The peripherals are designed to support a comprehensive DSP capability, operating with a high degree of autonomy from

the host processor.

4.5.1

Event Loggers

The CS47L15 provides two event log functions, supporting multichannel, edge-sensitive monitoring and recording of

internal or external signals.

4.5.1.1 Overview

The event loggers allow status information to be captured from a large number of sources, to be prioritized and acted upon

as required. For the purposes of the event loggers, an event is recorded when a logic transition (edge) is detected on a

selected signal source.

The logged events are held in a FIFO buffer, which is managed by the application software. A 32-bit time stamp, derived

from one of the general-purpose timers, is associated and recorded with each FIFO index, to provide a comprehensive

record of the detected events.

Each event logger must be associated with one of the general-purpose timers. The selected timer is the source of time

stamp data for any logged events. If DSPCLK is disabled, the timer also provides the clock source for the event logger. (If

DSPCLK is enabled, DSPCLK is used as the clock source instead.)

A maximum of one event per cycle of the clock source can be logged. If more than one event occurs within the cycle time,

the highest priority (lowest channel number) event is logged at the rising edge of the clock. In this case, any lower priority

events is queued, and is logged as soon as no higher priority events are pending. It is possible for recurring events on a

high-priority channel to be logged, while low-priority ones remain queued. Note that recurring instances of events that are

queued would not be logged.

The event logger can use a slow clock (e.g., 32 kHz), but higher clock frequencies may also be commonly used, depending

on the application and use case. The clock frequency determines the maximum possible event logging rate.

4.5.1.2 Event Logger Control

The event logger is enabled by setting EVENTLOGn_ENA (where n identifies the respective event logger, 1 or 2).

The event logger can be reset by writing 1 to EVENTLOGn_RST. Executing this function clears all the event logger status

flags and clears the contents of the FIFO buffer.

The associated timer (and time-stamp source) is selected using EVENTLOGn_TIME_SEL. Note that the event logger

must be disabled (EVENTLOGn_ENA = 0) when selecting the timer source.

4.5.1.3 Input Channel Configuration

The event logger allows up to 16 input channels to be configured for detection and logging. The EVENTLOGn_CHx_SEL

field selects the applicable input source for each channel (where x identifies the channel number, 1 to 16). The polarity

selection and debounce options are configured using the EVENTLOGn_CHx_POL and EVENTLOGn_CHx_DB bits

respectively.

The input channels can be enabled or disabled freely, using EVENTLOGn_CHx_ENA, without having to disable the event

logger entirely. An input channel must be disabled whenever the associated x_SEL, x_POL, or x_DB fields are written. It

is possible to reconfigure input channels while the event logger is enabled, provided the channels being reconfigured are

disabled when doing so.

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